JPH0356890Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ultrasonic welding device for information recording substrates, and more particularly to an ultrasonic welding device for information recording substrates for manufacturing information recording substrates having an air sandwich structure.

[Prior art and its problems]

Figure 2 is a cross-sectional view of a general information recording substrate, Figure 3
The figure is a sectional view of essential parts of an example of a conventional ultrasonic welding apparatus for information recording substrates.

Generally, a disk-shaped information recording substrate 11 used for optical video disks, optical memories, etc. is made of a disk 12 made of a transparent plastic material, such as acrylic resin or polycarbonate resin, for transmitting optical signals, as shown in FIG. It has light projection surface parts 12' and 13' on the front surface of 13, and thin film recording layers 14 and 15 on the back surface of the recording layer 1.
4 and 15 are mutually opposed to each other, and the inner circumferential portion 17 is formed so that a hollow portion 16 is formed between the recording layers.
An air sandwich structure is employed, which is joined at the outer peripheral edge 18 and has a center hole 21.

Conventionally, as shown in FIG. 3, in an apparatus for manufacturing an information recording substrate 11 having such an air sandwich structure, an inner circumferential portion 1 protruding from recording layers 14 and 15 is used.
7 and two disks 1 forming an outer peripheral edge 18
An apparatus is used that uses ultrasonic waves to melt and join the annular protrusions 19 and 20 formed on the joint surface of either one of the joints 2 and 13. That is, a base 22 is provided with a shaft 24 at the center that is made of plastic material and fits into the center hole 21 of the transparent disks 12 and 13, and above the center line of the base 22 is a transducer 23 that generates ultrasonic waves. It is a welding device with a movably mounted structure.

Information recording substrate 11 is melted using this conventional melting device.
To make the disk 13, first make the center hole 21 of the disk 13.
is inserted along the shaft 24 and pressed against the base 22, and then the center hole 21 of the disk 12 is inserted again along the shaft 24 from above. When the disks 12 and 13 overlap, the vibrator 23 descends from the top, pressurizes the disks 12 and 13, and then applies ultrasonic waves, causing the annular protrusion 19 provided on the disk 12 to
The information recording substrate 11 was manufactured by melting the discs 12 and 20 and welding the disks 12 and 13 together.

However, when such a conventional welding device is used, the base 22 and the vibrator 23 are attached to the disk 12.
Since the contact surfaces 22' and 23 in contact with the disks 12 and 13 are flat, and the projection surfaces 12' and 13' and the contact surfaces 22' and 23 come into direct contact with each other when applying ultrasonic waves, the surfaces of the disks 12 and 13 are not scratched. This has the disadvantage that it adversely affects the recording layers 14 and 15 on the back side.

Furthermore, such flat contact surfaces 22' and 2
3', when the disks 12 and 13 are melted under pressure, the amplitude of the ultrasonic waves is applied directly to the entire substrate, resulting in large welding distortion and partially steep warping in the information recording substrate 11 after welding. There are drawbacks.

In addition, the vibrator 23 has a large effect on weldability.
To align the base 22 with the shaft 2 at the center of the base 22,
Since 4 is protruding, it is not possible to measure accurately, so if parallelization is not performed accurately,
Some of the annular protrusions 19 and 20 are poorly welded,
It has the disadvantage of causing peeling.

[Purpose of invention]

The present invention eliminates these conventional drawbacks, and provides information recording using an air sandwich structure that does not affect the recording layer or projection surface, does not distort or warp the substrate after welding, and has excellent weldability. An apparatus for ultrasonic welding of substrates is provided.

[Structure of the idea]

The ultrasonic welding apparatus for information recording substrates of the present invention includes a base having a central axis on which two optical disks are inserted and placed, and two optical discs that are lowered toward the base from above. A vibrator that generates ultrasonic waves for pressing two optical disks and welding the inner and outer peripheries to form an information recording substrate with an air sandwich structure, and contact of the base and the vibrator with the optical disk. A groove is provided on the surface to prevent contact with the projection surface portion of the optical disk, and a hole is provided in the center of the contact surface of the vibrator to prevent contact with the central axis.

Further, the ultrasonic welding apparatus for information recording substrates of the present invention includes means for automatically adjusting the parallelism between the base and the vibrator.

[Detailed explanation of configuration]

The present invention solves the problems of the prior art by adopting the above-mentioned configuration. First, by creating grooves on the surfaces of the base and vibrator that contact the disk so that the projection surface does not come in contact with them, and creating a structure that allows only the inner and outer periphery of the disk to be pressed, it is possible to prevent scratches on the projection surface and to record marks on the back surface. Not only is the negative effect on the layer eliminated, but the ultrasonic amplitude is concentrated on the inner and outer periphery of the disk, making it possible to manufacture information recording substrates with less welding distortion and warpage.

Furthermore, since the base is equipped with a self-aligning mechanism and the vibrator and the base can be automatically and precisely aligned in parallel, the problem of poor welding of the annular protrusion due to poor parallelization is also resolved.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIGS. 1a and 1b are sectional views of essential parts of the first and second embodiments of the present invention, respectively.

A first embodiment will be described with reference to FIG. 1a. The base 1 has a shaft 2 at its upper center for positioning the disks 12 and 13, and a groove 3 is provided on the surface that the disk 13 comes into contact with so that the projection surface 13' does not come into contact with it. Furthermore, above the center line of the substrate 1, a vibrator 4 that generates ultrasonic waves is supported by a vertical mechanism (not shown). Vibrator 4 is disk 1
A groove 5 is provided so that the projection surface portion 12' does not touch the surface with which the base 1 contacts, and a hole 6 is provided at the center so that the shaft 2 of the base 1 does not come into contact with it.

The welding work of the information recording substrate 11 according to this embodiment is as shown in FIG. Install. Next, the center hole 2 of the disk 12 with the recording layer 15 facing downward.
1 is inserted into the shaft 2 again, and when the disks 12 and 13 overlap, the vibrator 4 descends from above to apply pressure and then apply ultrasonic waves to form the information recording substrate 11.

At this time, the projection surface parts 12' and 13' are connected to the base 1 by the grooves 3 and 5 provided in the base 1 and the vibrator 4.
Since it is not in direct contact with the vibrator 4, no scratches occur on the surface, and there is no adverse effect on the recording layers 14 and 15 on the back surface.

Furthermore, the amplitude of the ultrasonic waves is
Since the welding is concentrated on the inner circumferential portion 17 and outer circumferential edge portion 18 that are in contact with the
An information recording substrate 11 with a small value of about 100 μm can be obtained.

Next, a second embodiment will be described with reference to FIG. 1b. In addition to the first embodiment described above, the present embodiment further includes a shaft 7 at the lower center of the base 1.
It is inserted and supported by a spherical bearing 9 attached to a base plate 8. With this configuration, even if the parallelism between the vibrator 4 and the base 1 is not normal when the vibrator 4 is lowered for pressing and welding, the Due to the action of the spherical bearing 9, the vibrator 4 and the disk 1
2 is precisely aligned and the adhesion is improved, welding of the annular protrusions 19 and 20 becomes uniform, and an information recording substrate 11 with strong bonding strength without welding defects is obtained.

[Effects of the invention] As explained above, the present invention has a spherical bearing mounted on the base to provide an automatic parallel alignment function for the vibrator, and furthermore, grooves are provided on the base and the end faces of the vibrator so that the inside and outer circumference of the disk can be easily aligned. By pressing and welding only the welded parts, it is possible to eliminate the conventional problems of scratches on the disk surface and negative effects on the recording layer, and also to suppress the occurrence of welding distortion and steep warping in parts, and to further reduce the welded area. This has the effect of providing an information recording substrate with uniform bonding strength, strong bonding strength, and extremely high quality.

[Brief explanation of the drawing]

Figures 1a and b are sectional views of main parts of the first and second embodiments of the present invention, Figure 2 is a sectional view of a general information recording substrate, and Figure 3 is a cross-sectional view of a conventional information recording substrate. FIG. 1 is a sectional view of a main part of an example of a sonic welding device. 1, 22... Base, 2, 7, 24... Axis, 3,
5... Groove, 4, 23... Vibrator, 6... Hole, 8...
... Base plate, 9 ... Spherical bearing, 11 ... Information recording board, 12, 13 ... Disk, 12',
13'...Projection surface section, 14, 15...Recording layer, 1
6... Hollow part, 17... Inner peripheral part, 18... Outer peripheral edge, 19, 20... Annular projection, 21... Center hole,
22', 23'...contact surfaces.

Claims (1)

[Claims for Utility Model Registration] 1. A base having a central axis on which two optical disks are inserted and placed, and a base that descends toward the base from above and holds the two optical disks thereon. In an ultrasonic welding apparatus for information recording substrates, the apparatus includes a vibrator that generates ultrasonic waves in order to press the base and weld the inner and outer peripheries of the substrate to form an information recording substrate with an air sandwich structure. The transducer is characterized in that a contact surface with the optical disk is provided with a groove for preventing contact with the projection surface portion of the optical disk, and a hole in the center of the contact surface of the vibrator for preventing contact with the central axis. Ultrasonic welding equipment for information recording boards. 2. An information recording substrate ultrasonic welding device as set forth in claim (1) of the utility model registration, characterized in that the information recording substrate is equipped with means for automatically adjusting the parallelism between the base and the vibrator. ultrasonic welding equipment.